:root{color-scheme:light;--paper:#f6f5ee;--panel:#fffefa;--ink:#142d28;--muted:#526762;--line:#d5dfd6;--teal:#126858;--teal-light:#e5f2ea;--orange:#be4626;--blue:#2460a4;--shadow:0 5px 22px #1a3b2b0b}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"Segoe UI",sans-serif;font-size:15px;line-height:1.48}
a{color:var(--teal)}
.masthead,main,footer{width:min(1240px,calc(100% - 48px));margin:auto}
.masthead{min-height:64px;display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);font-weight:650;font-size:.86rem}
.masthead img{display:block;object-fit:contain}
.theory-link{margin-left:auto;font-weight:650;text-decoration:none;white-space:nowrap}
.intro{display:flex;align-items:end;justify-content:space-between;gap:24px;margin:24px 0 22px}
.eyebrow{font-size:.68rem;font-weight:800;letter-spacing:.13em;color:var(--teal);margin:0 0 5px}
h1,h2,h3,p{margin:0}
h1{font-family:"Instrument Serif",Georgia,serif;font-weight:500;font-size:clamp(2.6rem,6vw,4.1rem);line-height:1.02;letter-spacing:-.05em}
h2{font-size:1.1rem;line-height:1.25;letter-spacing:-.025em}
.intro>p{max-width:370px;color:var(--muted);padding-bottom:3px}
.lab{display:grid;grid-template-columns:260px minmax(0,1fr);gap:16px;align-items:stretch}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);min-width:0}
.settings{padding:18px;display:flex;flex-direction:column}
.settings h2{margin-bottom:14px}
label{font-size:.81rem;font-weight:650}
select,.inputs input{width:100%;min-width:0;background:#fff;border:1px solid #bbcfc3;border-radius:8px;color:var(--ink);font:inherit;padding:7px 8px}
select{margin-top:5px;font-size:.89rem}
.formula{padding:9px;margin:10px 0 12px;background:var(--teal-light);border-radius:8px;color:#155747;font-family:Georgia,serif;font-size:1.17rem}
.inputs{display:grid;grid-template-columns:1fr 1fr;gap:9px}
.inputs input{margin-top:3px}
.range-label{display:flex;justify-content:space-between;gap:6px;margin-top:12px}
.range-label span:last-child{color:var(--muted);font-weight:400}
input[type=range]{width:100%;accent-color:var(--teal);margin:6px 0 9px;min-height:22px}
.toggles{display:grid;gap:5px;margin:6px 0 14px}
.toggles label{display:flex;gap:7px;align-items:center;font-weight:500}
input[type=checkbox]{accent-color:var(--teal);width:16px;height:16px}
button{border:1px solid #bacdc2;border-radius:8px;background:#fffefa;color:var(--ink);padding:7px 10px;font:inherit;font-weight:650;font-size:.79rem;cursor:pointer}
button:hover:not(:disabled){background:var(--teal-light)}
button:disabled{opacity:.43;cursor:default}
button.primary{background:var(--teal);color:white;border-color:var(--teal)}
button.primary:hover:not(:disabled){background:#0d5144}
:focus-visible{outline:3px solid #a05a16;outline-offset:2px}
.reset{text-align:left;margin-top:auto}
.notice{margin-top:8px;color:#8d311a;font-size:.79rem}
.notice:empty{display:none}
.explorer{padding:15px 16px 12px}
.graph-header,.table-heading{display:flex;align-items:center;justify-content:space-between;gap:8px}
.view-buttons{display:flex;gap:5px}
.view-buttons button{padding:5px 8px}
.chart-wrap{height:clamp(288px,37vw,390px);margin:10px 0 7px;border:1px solid var(--line);border-radius:11px;background:#fcfdf8;overflow:hidden}
#chart{width:100%;height:100%;display:block;cursor:grab;touch-action:none}
#chart:active{cursor:grabbing}
.legend{display:flex;flex-wrap:wrap;gap:7px 16px;align-items:center;font-size:.75rem;color:var(--muted)}
.legend span{display:inline-flex;align-items:center;gap:5px}
.legend [hidden]{display:none}
.swatch{width:19px;display:inline-block;border-top:3px solid}
.swatch.euler{border-color:var(--orange)}
.swatch.half{border-color:var(--blue);border-top-style:dashed}
.swatch.exact{border-color:var(--teal)}
.graph-tip{margin-left:auto}
.playback{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.timeline{display:flex;align-items:center;gap:10px}
.timeline label{white-space:nowrap}
.timeline input{margin:5px 0 0}
.readout{display:grid;grid-template-columns:minmax(250px,.8fr) minmax(0,1.25fr);gap:16px;margin-top:16px}
.calculation,.table-panel{padding:17px}
.calculation h2{margin-bottom:10px}
.calculation #calculation{font-variant-numeric:tabular-nums}
.math-line{margin:5px 0}
.math-line strong{color:var(--orange)}
.comparison{background:var(--teal-light);border-radius:9px;margin-top:12px;padding:9px 11px;font-size:.83rem}
.table-scroll{overflow:auto;max-height:262px;margin:9px 0;border:1px solid var(--line);border-radius:9px}
table{border-collapse:collapse;width:100%;font-size:.82rem;font-variant-numeric:tabular-nums;white-space:nowrap}
th,td{text-align:right;padding:5px 8px;border-bottom:1px solid #e5ebe4}
thead th{position:sticky;top:0;background:#eef4ed;z-index:1}
th:first-child,td:first-child{text-align:center}
td button{padding:2px 7px;min-width:30px}
tr.active{background:#faeade}
tr.future{color:var(--muted)}
.muted{color:var(--muted);font-size:.82rem}
.theory{padding:24px 0 25px;margin-top:16px;border-top:1px solid var(--line)}
.theory h2{font-size:1.55rem;margin-bottom:8px}
.theory>p:not(.eyebrow){max-width:76ch}
.rules{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:13px 0 10px}
.rules div{display:grid;gap:3px;padding:9px 11px;background:var(--panel);border:1px solid var(--line);border-radius:9px}
.rules span{font-size:.76rem;color:var(--muted)}
.rules b{font-family:Georgia,serif;font-size:1.15rem;font-weight:500}
.challenge{margin-top:16px;padding:12px 15px;border-left:3px solid var(--orange);background:#fff4e9;border-radius:0 9px 9px 0}
.challenge ol{margin:6px 0;padding-left:19px}
.challenge li{margin:3px 0}
summary{cursor:pointer;font-size:.85rem;font-weight:700}
details p{margin:5px 0 0}
footer{border-top:1px solid var(--line);display:flex;justify-content:space-between;padding:13px 0 19px;color:var(--muted);font-size:.82rem}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
@media(max-width:800px){.lab{grid-template-columns:215px minmax(0,1fr)}.settings{padding:14px}.graph-tip{display:none!important}}
@media(max-width:660px){.masthead,main,footer{width:calc(100% - 24px)}.masthead{gap:9px}.masthead span{font-size:.75rem}.intro{display:block;margin:18px 0 15px}.intro>p{margin-top:8px}.lab,.readout{grid-template-columns:minmax(0,1fr);gap:11px}.settings,.explorer,.calculation,.table-panel{padding:12px}.chart-wrap{height:310px}.toggles{grid-template-columns:repeat(2,minmax(0,1fr))}.rules{grid-template-columns:1fr}.playback button{padding:7px}.readout{margin-top:11px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}